Wrench



I U ITED STATES PATENT OFFICE.

GEORGE F. NEWELL, OF BOSTON, MASSACHUSETTS.

WRENCH.

SPECIFICATION forming partof IJettersIatent No. 279,661, dated June 19,1883.

Application filed April 4, 1883. (No model.)

To all whom it may concern:

Be it known that I, GEORGE F. NEWELL, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain Improvementsin Vrenches, of which the follow ing is a full, clear, and exactdescription, reference being had to the accompanying draw- ,ings, makingpart of this specification, in

which- Figure 1 is a plan of a nut-wrench eonstrueted in accordance withmy invention, the two jaws being closed together. Fig. 2 is an elevationof the same, the movable jaw being in the position it occupies whenfirst adjusted and brought'up against the sides ofa nut. Fig. 3 is avertical longitudinal section representing the position of the movablejaw when tightened against the nut to securely grasp and remove thesame, the wrench resting in an upright position. Fi 4 is a verticaltransverse section on the line .70 0c of Fig. 3.

My present invention has special reference to that class of wrenchesdesigned for use in removing and tightening nuts of carriageaxles,bolts, &c.; and it consists in a serrated arm provided with a stationaryjaw and a longitudinal shouldered slot, a movable serrated jaw providedwith a screw-threaded projection passing through said slot, and with aspring for pressing the movable jaw away from the stationary jaw, incombination with a device for drawing and clamping-the movable jawagainst the stationary jaw when adjusted upon the sides of the nut.

To enable others skilled in the art to understand and use my invention,I will proceed to describe the manner in which I have carried it out. Y

In the said drawings, A represents a metal arm, bent in. the form shown,being provided with a stationary jaw, a, .at one end,'and a handle, I),having a knob, c, at its other end. The portion (Z of the arm Aintermediate of the handle and stationary jaw is of greater width, andhas formed through it a rectangw lar slot, contracted near its bottom bya square shoulder, 71, extending around it. Downwardlythrough this slotpasses the screwshank o',projecting from the under side of theturned-down rectangular portion k of the bottom of a movablcjaw, I, saidrectangular portion k being of the same width 'as the upper part of theslot, and serving as a guide to keep the movable jaw from lateral playwhen adjusted to and from the stationary jaw. The screw-shank is turnedsmooth at its upper end, and is surrounded by a spiral spring, on, theupper end of which bears against the rectangular guide lr, and the lowerend of the spring resting 011 a washer, 12, also surrounding thescrew-shank i, the diameter of the washer being greater than the widthof the contracted part of the slot to insure its retention therein. Thelower portion of the screwshank projects below the slot, and has turnedthereover a thumb-nut, B, by which the movable jaw may be tightened orloosened, as required. The upper surface of the portion 12 of the arm issmooth from the foot of the stationary jaw to a point, 0, near theopposite end ofthe slot, from which point to a point, 0, beyond saidslot it is serrated, and the under side of the movable jaw is similarlyprovided with a smooth and a serrated portion. WVhen the thumb-nut B isloosened the spring presses the movable jaw up, and thuskeeps its lowersmooth and serrated surfaces out of contact witlrthe smooth and serratedsurfaces of the arm beneath, thereby permitting the free traverse of themovable jaw to and from the stationary jaw. \Vhen a nut is to betightened or removed the movable jaw is brought up against the twocontiguous sides of the nut, in which position the serrated surface ofthe movable jaw engages with. the serrated surface of the arm A andprevents the slipping of the movable jaw, the smooth surface of themovable jaw being slightly removed above the smooth surface of the arm,after which the clamping of the thumb-nut against the under side of theslotted portion of the, arm causes the front of the-mider side or smoothportion of the movable jaw to be brought squarely down upon thecorresponding smooth surface of the arm, and the inner sides of the jawfirmly grasp the contiguous sides of the nut, whereby the latter isturned on or off its seat, as desired. The under side of the front ofthe arm beneath the stationary jaw is provided with a square foot orrest, 1), by which the wrench may be placed and supported in an uprightposition, as seen in Fig. 3, with the

